★This set includes 2 each of 2 different lengths of 7mm diameter mass damper, which measure 5.5mm (1.5g) and 11.5mm (3g) respectively. ★Their slimline form makes them great for use in cluttered spaces, and they are of a different weight to existing mass damper options, broadening your setup horizons. Compatible Chassis All Mini 4WD and Mini 4WD PRO cars (★Some chassis or bodies may require modification.)